Radio receiving system



Dec. 18 1923. Mflfifl? J. MILLS RADIO RECEIVING SYSTEM FiledDec. 22, 1920 Mme ll //7 V6/7/0l". John M/V/S.

Patented Dec. lid, EQZSK.

entrain stares entrant aroma MILLS, 011" VVYOEHNG, NEW JTERSEY, ASSllG-NOR T WESTERN ELIE (WEEK? @tllllfl- EANY, TIICQRPORATED, @E NEW YORK, N. EEC, A

CORPORATION Q1? NEW name nnenrvrne srsrma.

Application filed weeemter ea; 1920). serial Etc. 482,416.

To all-whom it may concern:

Be it known that l, JOHN MILLs, a citizen of the United States, residing at Wyoming, in the county of Essex, State of New Jersey, have invented certain new and useful limprovements in Radio Receiving Systems, of

which the following is a full, clear, concise,

and exact description.

This invention relates to a'radio receiving system: and more particularly to a method of and means for protecting the receiving device of a radio system from interference due to static or natural atmospheric conditions.

ceived signal waves without correspondingly increasing the energy of interfering waves such as static.

- A further object consists in increasing the frequency of the received waves at a receiving station in order to enable greater discrunination against long interfering waves. In accordance with this invention, the incoming waves are received at two stations so placed that signal waves incident upon their antennae are 180 out of phase and are separately utilized to modulate waves of a much higher fre uency than the received waves. The mo ulated waves are transmitted from two stations radiating a small amount of ower to a local receiving station symmetrica ly placed relatively to said two transmitting stations. Interfering waves of various kinds including static of the vertically directed ty e afiect the two antennae simultaneousl ,w 180,out of phase and hence the former are balanced in their efiect upon the ultimate receiving antenna but the signal waves are additive. Since the distance over which transmission takes'place is relatively short, nopart'icular difficulty will be experienced in making the ratio of signal to static current at the ultimate receiving station so ereas the signal waves are onant to the frequency of the incoming signal waves.

Each antenna is coupled by the transformer 3 to a resonant circuit 4 tuned to the frequency of the incoming signal waves. These tuned circuits are connected across the input circuits of am lifiers 5 of any wellknown construction ut which may be of the vacuum tube type, the output circuits of which are coupled by transformers 6 to the input circuits of modulators 7. Carrier sources 8, adapted to supply current of the same but a very much higher frequency than that emplo ed for signaling purposes, are connected in the input circuits of the modulators 7. The output circuits of the modulatorsare each coupled by a transformer 9 to a transmitting antenna 10.

As thus far described, the operation of this system is as follows: An incoming nuature of static and .signal currents absorbed by the receiving antennae is amplified in the main receiving stations and applied by the transformers 6 to modulate, the higl'l-freuency current supplied by the sources 8, t e modulated carrier waves being radiated by the antennae 10.

The currents supplied by the sources 8 to the modulators 7 should be of the same frequency, which may be, a higher harmonic of the incoming signal waves, thou h this relation is not essential, and can be derived from a single source, as forexample, from the incoming signal itself by means of a harmonic stations A and B.

The transmitted waves from these two sta- "tions are received at'a common receiving station C which is provided with an antenna 12, coupled by a transformer 13jto a circuit, which is selective of the frequency ofthe radiated waves from the-antennae 10. These waves are detected by the device 15, herein shown by way of example no of the audion generator located at each of theits type, and impressed upon the signal receiver plifiers are now well-known, it is believed that a detailed description of their circuits and operaton is unnecessary.

The type of interfering waves assumed including static will produce only a feeble effect in the local receiving circuit,since these are of relatively low frequency compared with the natural period of the circuit 14, while the locally radiated waves, of the frequency to which this circuit 14 is tuned, transmitted over a'relatively short distance, will produce a strong effect. Thus, with-a local station of small power, the ratio of the signal to static current at the common receiving station may be made so great, or, in other words, the last-mentioned station may be made to discriminate so sharply between these two currents, that interference will be substantially eliminated.

While certain circuits and specific details have been herein shown and described with the object of clearly and completely disclosing the invention -which is primarily designed to suppress interference due to vary ing static conditions b an" arrangement which does not require a j ustment, it is to be understood that they are not essential ele-- ments of a system for the purpose disclosed. Thus, any type of amplifier system, detector, modulator and modulating circuit may be used and the common receiving. station may occupy a non-symmetrical position relative to the two transmitting stations, the amount of energy transmitted from. the latter being regulated so as to produce the same effect at the former; though a symmetrical position is preferable.

Moreover, while this disclosure is limited to a radio receiving system; it is apparent that the principles of this invention are applicable to any radiant energy receiving system.

It is therefore obvious and it is to be understood that this invention is not limited to the arrangement herein set forth but only by the scope of the attached claims.

What is claimed is: 1. A method of receiving signal waves which comprises separately receiving a plurality of sets of incoming waves, iving the received waves a definite phase re ation, separately modulating a plurality of carrier waves by said-received waves, transmitting said modulated waves over two radiant energypaths, and receiving and combining the modulated waves, thereby suppressing interfering waves.

2. A method of receiving signal waves which comprises separately receiving two. ,sets of incoming waves, giving the received waves a definite phase relation and separately modulating two carrier waves. by said waves, transmitting said modulated waves over two radio paths and receiving and combining the modulated. waves.

3. The method of receiving radio signals Y the two sets of modulated waves at a single station[ 5. A radio receiving system comprising a pair of receivin stations, means at each station for receiving incoming waves, means for modulating.carrier waves by the separately received waves, means to determine a definite phase relation between the modulating waves, means for transmitting the modulated waves from a pair of antenna, a single antenna for receiving the two sets of modulated waves and a receiving circuit associated with thesingle antenna.

6. A radio receiving system comprising a pair of receiving stations spaced a half wave length apart, means for receiving incoming waves thereat, means at each receiving station for modulating a carrier Wave by the incoming waves, an antenna at each station for transmitting the modulated waves and means for receiving and combining the two modulated waves at a single station.

7. A radio receiving system comprising a pair of receiving stations, means at each station for receiving incoming waves, means for modulating carrier waves of one fre- III quency by the separately received waves,

means to determine a definite phase relation between the modulatin waves, means for transmitting the modufitted waves from a pair of antennae, a single antenna for receiving the two sets of modulated waves and a receiving circuit associated with the single antenna.

ante ter 8. A radio receiving system comprisin a pair of receiving stations spaced a halt wave length apart, means thereat for receiving incoming waves, means at each station for modulating a carrier, wave by the incoming mixture of static and signal waves, an antenna at each station fortransmittin the modulated waves and a station for said modulated waves.

9. A radio receiving system comprising a pair of receiving 'stations spaced apart, means at each station for receiving incoming waves, means at each station for modulating a carrier wave by the received waves, an antenna at each station for transmitting the modulated waves and a common receiving station for said-modulated waves'symmetrically placed with reference to said transmitt' antennae.

10. A re '0 receiving system compr' two receiving stations'ha means to determine a definite phase ang e between two sets of waves received thereby, means to modulate two carrier waves by the received waves, means to transmit the two carrier waves from said stations and an ultimate receiving station having means to combine said two modulated waves.

11. A receiving system for signal waves adapted to suppress interfering waves cemcommon receiving prising a plurality each including wave receiving and transmitting apparatus, said transmitting apparatuses having means to increase the frequency of receiving station for the waves of increased frequency.

12. A receiving system for signal waves adapted to suppress interfering waves comprising a plurality of signal stations spaced apart, each including wave receiving and transmitting apparatus, said transmitting apparatuses havmg means to increase the energy of the received waves and a common receiving station for the waves of increased energy. I

13. A receiving system for signal waves adapted to suppress interfering waves comprising a plurality of signal stations each having wave receiving apparatus; means to increase the energy of the received waves and means to transmit waves of increased energy, and a common receiving station for the waves of increased energy cooperating with the transmitting means to discriminate in favor of the desired signal wave.

In witness whereof, ll hereunto subscribe my name this 17th day of December A. D

JQIBIN mitts.

of stations spaced apart,

the received waves and a common 

